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I have been having a problem with a certain person and i need a legal advice.

I was employed as a shop attendant by a person i thought was my friend. He used to take money from the till and after one month, he had spent a total of 56,000. Later after he discovered it, he changed the ownership and gave it to his father who, made me account for everything. I prepared the documents and showed him the cashflow of the business since i was employed. Later, after i convinced him, he changed the ownership to another one of his sons and they wanted to force me to pay the 56,000 shilling but i refused. Later, we hired an auditor and we found out that the business cant account for 10,000, and i was asked to pay. We entered into an agreement that i pay the amount in  instalment but later, the family became too harsh on me and i gave up paying after i had payed 3,000. The agreement consisted of the family as witnesses and one of the brothers was the owner. If this issue goes to court, what can be my defence?